The R88M-1M3K010T-BS2: The closest sibling is the R88M-1M3K010T-BOS2 — same frame, same 3 kW / 1000 rpm / 240 VAC rating, same brake and absolute encoder — but the -BOS2 adds an oil-tight seal. If your application runs in a wet or oily environment (washdown, gearbox splash), that seal matters. In a dry cabinet, the -BS2 drops straight into the same mounting pattern and wiring harness without any rework.
Cylindrical body with key and tap — the keyway locks the shaft to the load coupling, and the tapped hole at the shaft end accepts a bolt for positive retention. 240 VAC single-phase supply powers both the motor windings and the brake coil. The absolute encoder eliminates the need for a home-search routine on power-up; position is read directly from the encoder count. No oil-tight seal means the motor should be mounted away from coolant spray or gearbox oil mist.